#0  0x00007fe37ca3acc9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#1  0x00007fe37ca3e0d8 in __GI_abort () at abort.c:89
  [Error: abort.c was not found in source tree]
#2  0x00007fe37ca77f24 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7fe37cb866c8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
  [Error: ../sysdeps/posix/libc_fatal.c was not found in source tree]
#3  0x00007fe37ca841fe in malloc_printerr (ptr=<optimized out>, str=0x7fe37cb827b9 "free(): invalid pointer", action=1) at malloc.c:4996
  [Error: malloc.c was not found in source tree]
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
  [Error: malloc.c was not found in source tree]
#5  0x000000000068efcb in php_module_shutdown () at /build/buildd/php5-5.5.9+dfsg/main/main.c:2384
  [Error: /build/buildd/php5-5.5.9+dfsg/main/main.c was not found in source tree]
#6  0x0000000000461cc6 in main (argc=7, argv=0x1898360) at /build/buildd/php5-5.5.9+dfsg/sapi/cli/php_cli.c:1393
  [Error: /build/buildd/php5-5.5.9+dfsg/sapi/cli/php_cli.c was not found in source tree]